If $ \cos^{-1}\left(\frac{x}{b}\right) = n \log \left(\frac{y}{n}\right) $, then __________.

Question

$ x y_1 = n \sqrt{b^2 - y^2} $

$ x y_1 + n \sqrt{b^2 - y^2} = 0 $

$ y_1 = x \sqrt{b^2 - y^2} $

$ x y_1 + \sqrt{b^2 - y^2} = 0 $

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